I have created plugIn which supports both cs5 and cs5.5.But i am unable to install my plugin ZXP in cs5 but it work well in cs5.5.And while installing ZXP in cs5 i am getting error like(Specified in screen shot)--

Is your plug-in (extension) supporting InDesign? If so, I am quite sure the $automate destination does not exist for that product. Based on the official Extension Manager documentation, InDesign should only support this two destinations: $indesign and $indesign_user.